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EC number: 232-991-2 | CAS number: 9080-56-2
The aquatic toxicity data were obtained from short term toxicity studies in daphnia and the algal growth inhibition test. Daphnia were the most sensitive species and hence data from the daphnia study are the basis for the PNEC derivation.
Inhibition control carried out with enzymes in the test of ready biodegradability showed no inhibition of the activated sludge inoculum at an enzyme concentration above the expected levels in inlet to sewage treatment plants (STPs). Monitoring of enzymes in the inlet to municipal STPs (in Denmark) resulted in concentrations of less than 2 µg active enzyme protein (aep)/L which are below the initial concentration used in tests for ready biodegradability, where no inhibitory effects were observed. It is concluded that a study on activated sludge respiration inhibition does not need to be conducted. Therefore, the test enzyme is not considered to be toxic to microorganisms.
The EC50 forbacillolysisn was between 3.6 and 7.8 mg active enzyme protein/L and the value of 3.6 mg aep/L was used for PNEC derivation and the assessment factors 1000 and 10000 were applied for fresh and marine water, respectively.
The PNEC value for STP is based on actual measurements of enzyme concentration in STP connected to manufacturing site. Up to 65000 µg aep/L were detected in STP connected to manufacturing site and since there was no negative impact observed, this concentration is the estimated PNEC value for STP.
PNEC values for sediment exposure have not been derived because the enzyme is readily biodegradable, highly water soluble and has a very low potential for adsorption to sediments. Exposure of the sediment to toxicologically significant concentrations of the enzyme is thus not expected.
Based on the aquatic toxicity studies and the ready biodegradation of the enzyme, the enzyme is not classified.
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